If you want to use not CDN but local mathjax scripts, you can use git clone recursive. ( In most cases, CDN is much faster than your server. )

$ git clone --recursive https://github.com/jmnote/SimpleMathJax.git

SimpleMathJax is meant to be used as an alternative to the Math extension.
If the Math extension is installed it may take precedence and cause SimpleMathJax to not work.
The SimpleMathJax extension is the only thing you need to start rendering equations.

環境設定

The following variables can be defined in LocalSettings.php after calling wfLoadExtension( 'SimpleMathJax' );. Note that for a simple site adding $wgSmjSize = 110; might be all you need to make it Just Work™.